If the partial pressure of the diatomic gas is 0.810 atm, what is the total pressure?

Now, it shows a picture of 3 gases, and it says count the INDEPENDENT particles. So:

Answer 1

Consider a particle to be
a single unconnected ball
2 balls together count as a single particle (these are the diatomic particles.)
3 balls together count as a single particle.

Using those definition of particles
count the total number of particles = T
count the total number of diatomic particles = D
Total pressure = 0.810atm x [T/D]

Or you could think about it like
0.810atm / D = the pressure per particle.
pressure per particle x # particles = total pressure.

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